etl_code/summon/CleanReducer.java
import java.io.IOException;

import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Reducer;

public class CleanReducer
  extends Reducer<Text, IntWritable, Text, IntWritable> {
  
  @Override
  public void reduce(Text key, Iterable<IntWritable> values,
      Context context)
      throws IOException, InterruptedException {
    // int sum = 0;
    // for (IntWritable value : values) {
    //   sum += value.get();
    // }
    
    context.write(key,null);

    }
    
}